It was discovered that when exec'ing from a non-leader thread, armed POSIX CPU timers would be left on a list but freed, leading to a use-after-free.
Exploitability
AV:LAC:HPR:LUI:NScope
S:UImpact
C:NI:LA:H5.3/CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:HMemory Safety